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Property Plant and Equipment (Information) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]      
Balance at beginning of year $ 5,331    
IFRS 16 initial implementation   $ 339  
Reversal of impairment 0 (10) $ 0
Balance at end of year 5,550 5,331  
Depreciated balance at end of year 5,331 5,331  
Gross [Member]      
Property, Plant and Equipment [Line Items]      
Balance at beginning of year 11,194 10,237  
IFRS 16 initial implementation   300  
Reclassification of finance lease [1]   96  
Additions 675 714  
Disposals (69) (132)  
Exit from consolidation (26)    
Translation differences 243 (21)  
Balance at end of year 12,017 11,194 10,237
Depreciated balance at end of year 12,017 10,237 10,237
Accumulated depreciation [Member]      
Property, Plant and Equipment [Line Items]      
Balance at beginning of year 5,863 5,574  
Depreciation for the year 461 415  
Impairment 85    
Disposals (59) (102)  
Exit from consolidation (10)    
Reversal of impairment   (10)  
Translation differences 127 (14)  
Balance at end of year 6,467 5,863 5,574
Depreciated balance at end of year 6,467 5,574 5,574
Land and buildings [Member]      
Property, Plant and Equipment [Line Items]      
Balance at beginning of year 359    
Balance at end of year 389 359  
Depreciated balance at end of year 359 359  
Land and buildings [Member] | Gross [Member]      
Property, Plant and Equipment [Line Items]      
Balance at beginning of year 804 861  
IFRS 16 initial implementation   0  
Reclassification of finance lease [1]   0  
Additions 63 17  
Disposals (7) (69)  
Exit from consolidation (14)    
Translation differences 34 (5)  
Balance at end of year 880 804 861
Depreciated balance at end of year 880 861 861
Land and buildings [Member] | Accumulated depreciation [Member]      
Property, Plant and Equipment [Line Items]      
Balance at beginning of year 445 468  
Depreciation for the year 35 36  
Impairment 0    
Disposals (6) (45)  
Exit from consolidation (2)    
Reversal of impairment   (10)  
Translation differences 19 (4)  
Balance at end of year 491 445 468
Depreciated balance at end of year 491 468 468
Technical equipment and machinery [Member]      
Property, Plant and Equipment [Line Items]      
Balance at beginning of year 2,915    
Balance at end of year 3,119 2,915  
Depreciated balance at end of year 2,915 2,915  
Technical equipment and machinery [Member] | Gross [Member]      
Property, Plant and Equipment [Line Items]      
Balance at beginning of year 6,865 6,635  
IFRS 16 initial implementation   0  
Reclassification of finance lease [1]   0  
Additions 467 283  
Disposals (34) (47)  
Exit from consolidation (5)    
Translation differences 126 (6)  
Balance at end of year 7,419 6,865 6,635
Depreciated balance at end of year 7,419 6,635 6,635
Technical equipment and machinery [Member] | Accumulated depreciation [Member]      
Property, Plant and Equipment [Line Items]      
Balance at beginning of year 3,950 3,782  
Depreciation for the year 246 218  
Impairment 58    
Disposals (31) (44)  
Exit from consolidation (4)    
Reversal of impairment   0  
Translation differences 81 (6)  
Balance at end of year 4,300 3,950 3,782
Depreciated balance at end of year 4,300 3,782 3,782
Dikes and evaporating ponds [Member]      
Property, Plant and Equipment [Line Items]      
Balance at beginning of year 726    
Balance at end of year 678 726  
Depreciated balance at end of year 726 726  
Dikes and evaporating ponds [Member] | Gross [Member]      
Property, Plant and Equipment [Line Items]      
Balance at beginning of year 1,392 1,376  
IFRS 16 initial implementation   0  
Reclassification of finance lease [1]   0  
Additions 21 21  
Disposals 0 0  
Exit from consolidation 0    
Translation differences 28 (5)  
Balance at end of year 1,441 1,392 1,376
Depreciated balance at end of year 1,441 1,376 1,376
Dikes and evaporating ponds [Member] | Accumulated depreciation [Member]      
Property, Plant and Equipment [Line Items]      
Balance at beginning of year 666 627  
Depreciation for the year 47 43  
Impairment 27    
Disposals 0 0  
Exit from consolidation 0    
Reversal of impairment   0  
Translation differences 23 (4)  
Balance at end of year 763 666 627
Depreciated balance at end of year 763 627 627
Plants under construction [Member]      
Property, Plant and Equipment [Line Items]      
Balance at beginning of year [2] 765    
Balance at end of year [2] 778 765  
Depreciated balance at end of year [2] 765 765  
Plants under construction [Member] | Gross [Member]      
Property, Plant and Equipment [Line Items]      
Balance at beginning of year [2] 765 507  
IFRS 16 initial implementation [2]   0  
Reclassification of finance lease [1],[2]   0  
Additions [2] (24) 261  
Disposals [2] 0 0  
Exit from consolidation [2] 0    
Translation differences [2] 37 (3)  
Balance at end of year [2] 778 765 507
Depreciated balance at end of year [2] 778 507 507
Plants under construction [Member] | Accumulated depreciation [Member]      
Property, Plant and Equipment [Line Items]      
Balance at beginning of year [2] 0 0  
Depreciation for the year [2] 0 0  
Impairment [2] 0    
Disposals [2] 0 0  
Exit from consolidation [2] 0    
Reversal of impairment [2]   0  
Translation differences [2] 0 0  
Balance at end of year [2] 0 0 0
Depreciated balance at end of year [2] 0 0 0
Other [Member]      
Property, Plant and Equipment [Line Items]      
Balance at beginning of year 185    
Balance at end of year 186 185  
Depreciated balance at end of year 185 185  
Other [Member] | Gross [Member]      
Property, Plant and Equipment [Line Items]      
Balance at beginning of year 945 858  
IFRS 16 initial implementation   0  
Reclassification of finance lease [1]   0  
Additions 68 93  
Disposals (7) (5)  
Exit from consolidation (6)    
Translation differences 3 (1)  
Balance at end of year 1,003 945 858
Depreciated balance at end of year 1,003 858 858
Other [Member] | Accumulated depreciation [Member]      
Property, Plant and Equipment [Line Items]      
Balance at beginning of year 760 697  
Depreciation for the year 66 67  
Impairment 0    
Disposals (7) (4)  
Exit from consolidation (4)    
Reversal of impairment   0  
Translation differences 2 0  
Balance at end of year 817 760 697
Depreciated balance at end of year 817 697 697
Right of Use asset [Member]      
Property, Plant and Equipment [Line Items]      
Balance at beginning of year 381    
Balance at end of year 400 381  
Depreciated balance at end of year 381 381  
Right of Use asset [Member] | Gross [Member]      
Property, Plant and Equipment [Line Items]      
Balance at beginning of year 423 0  
IFRS 16 initial implementation   300  
Reclassification of finance lease [1]   96  
Additions 80 39  
Disposals (21) (11)  
Exit from consolidation (1)    
Translation differences 15 (1)  
Balance at end of year 496 423 0
Depreciated balance at end of year 496 0 0
Right of Use asset [Member] | Accumulated depreciation [Member]      
Property, Plant and Equipment [Line Items]      
Balance at beginning of year 42 0  
Depreciation for the year 67 51  
Impairment 0    
Disposals (15) (9)  
Exit from consolidation 0    
Reversal of impairment   0  
Translation differences 2 0  
Balance at end of year 96 42 0
Depreciated balance at end of year $ 96 $ 0 $ 0
[1] Reclassification of finance leases (as defined in IAS 17) from non-current asset to property, plant and equipment.
[2] The additions are presented net of items for which construction has been completed and accordingly were reclassified to other categories in the “property, plant and equipment” section.